Orinoco Basin
Mostrando 1-12 de 18 artigos, teses e dissertações.
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1. Glyphosate commercial formulation effects on preoptic area and hypothalamus of Cardinal Neon Paracheirodon axelrodi (Characiformes: Characidae)
ABSTRACT In Colombia the use of glyphosate commercial formulations (Roundup™) for spraying have left deleterious effects on animals and humans. Much of this spraying takes place at the Orinoco basin, habitat of one of the most exported ornamental fish in Colombia, Cardinal neon. To evaluate the effect of Roundup Activo™ four experimental treatments were
Neotrop. ichthyol.. Publicado em: 25/11/2019
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2. A new species of whiptail armored catfish, genus Pseudohemiodon (Siluriformes: Loricariidae) from the Orinoco River basin, Llanos region of Colombia and Venezuela
ABSTRACT A new species of whiptail armored catfish belonging to the genus Pseudohemiodon is described. The new species inhabits aquatic systems of the Orinoco River basin, mostly in the Llanos region of Colombia and Venezuela. Previously, it had identified as P. laticeps erroneously. The genus Pseudohemiodon includes seven known species inhabit Amazon and Pa
Neotrop. ichthyol.. Publicado em: 18/07/2019
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3. Life-history characteristics of Pseudoplatystoma metaense (Teleostei: Siluriformes: Pimelodidae) from the northwestern Orinoco River Basin
RESUMO O bagre capararí (Pseudoplatystoma metaense) identificado na literatura antes de 2007 como P. tigrinum é uma das espécies de bagres mais importantes da pesca no noroeste do rio Orinoco, por sua abundância e alto preço de comercialização no mercado. O objetivo deste estudo foi obter parâmetros populacionais sobre a idade e crescimento do bagre
Neotrop. ichthyol.. Publicado em: 26/03/2018
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4. A new species of the Eigenmannia trilineata (Gymnotiformes: Sternopygidae) species group from the río Orinoco basin, Venezuela
ABSTRACT A new species of the Eigenmannia trilineata species group is described from the río Orinoco basin, Venezuela. The new species is distinguished from congeners by a unique set of characters including an ossified basibranchial 1; 198-217 anal-fin rays; suborbital depth, 21.3-26.1% HL; length of anterodorsal process of maxilla equal to the width of the
Neotrop. ichthyol.. Publicado em: 30/03/2017
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5. A new species of the catfish genus Centromochlus (Siluriformes: Auchenipteridae: Centromochlinae) from the upper rio Paraná basin, Brazil
Centromochlus abriga doze espécies, com registros para os principais sistemas fluviais de águas interiores da América do Sul, como o Orinoco, Essequibo, rios costeiros do Suriname, Amazonas, alto Paraná e São Francisco. A nova espécie é descrita do alto rio Paraná, a partir de material coletado em 1965 durante a construção da UHE Ilha Solteira, S�
Neotrop. ichthyol.. Publicado em: 2015-03
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6. Diet shift of Red Belly Pacu Piaractus brachypomus (Cuvier, 1818) (Characiformes: Serrasalmidae), a Neotropical fish, in the Sepik-Ramu River Basin, Papua New Guinea
Introduction of fish species is a globally widespread practice that causes losses of native species and homogenization of diversity within and across continents. Diet assessments are important tools to depict the ecological function of species introduced into novel ecosystem and possible direct and indirect ecological effects. In this study, we compare the d
Neotrop. ichthyol.. Publicado em: 09/01/2015
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7. A new species of Tyttocharax (Characiformes: Characidae: Stevardiinae) from the Güejar river, Orinoco river Basin, Colombia
A new Tyttocharax species from the Güejar River system, near the Macarena Mountains in Colombia is described. This is the first record for the genus from the Orinoco basin. The combination of the following characters distinguish Tyttocharax metae from its congeners: presence of bony hooks on the pectoral and caudal-fin rays; bony hooks on the anal-fin rays
Neotrop. ichthyol.. Publicado em: 2012-09
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8. Review of the andean armored catfishes of the genus Dolichancistrus Isbrücker (Siluriformes: Loricariidae)
The loricariid catfish genus Dolichancistrus is reviewed and four species recognized. Species of Dolichancistrus are distinguished from each other by the degree of development of the pectoral-fin spine, the form of the distal margin of the pelvic fin, the relative size and form of the cheek plates, the pattern of odontodes along the margin of the snout, the
Neotrop. ichthyol.. Publicado em: 2012-09
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9. Descrição de nove espécies novas de Phenacogaster (Ostariophysi: Characiformes: Characidae) e comentários sobre as demais espécies do gênero
Nine new species of Phenacogaster Eigenmann, 1907 are described: Phenacogaster capitulatus sp. nov. from the Neshuya River system, Ucayali River basin; Phenacogaster maculoblongus sp. nov. from the upper Cuyuni River, and tributaries of the lower Orinoco River; Phenacogaster napoatilis sp. nov. from the Napo River system, upper Amazon River basin; Phenacogas
Zoologia (Curitiba). Publicado em: 2010-04
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10. Redescription of Odontostilbe pulchra (Gill, 1858) (Teleostei : Characidae : Cheirodontinae), and description of two new species from the rio Orinoco basin
Odontostilbe pulchra, anteriormente considerada como species inquirenda em Cheirodontinae e registrada com dúvidas para a bacia do río Orinoco, é redescrita com a redescoberta de dois síntipos. Descrita originalmente para a ilha de Trinidad, O. pulchra apresenta-se largamente distribuída na Venezuela, incluindo a bacia do río Orinoco, pequenas bacias c
Publicado em: 2010
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11. Revisão taxonômica e morfológica do complexo Potamotrygon orbignyi (Castelnau, 1855) (Chondrichthyes: Myliobatiformes: Potamotrygonidae) / Taxonomic and morphological revision of the complex Potamotrygon orbignyi (Castelnau, 1855) (Chondrichthyes: Myliobatiformes: Potamotrygonidae)
The family Potamotrygonidae is a monophyletic group of rays exclusive of freshwater environment, occurring on the majority of South American neotropical rivers. It also presents an extremely confuse taxonomic situation due to its highly diverse disc coloration, the absence of a greater number of diagnostic characters to identify its members and the confusion
Publicado em: 2010
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12. Description of Neblinichthys brevibracchium and N. echinasus from the upper Mazaruni River, Guyana (Siluriformes: Loricariidae), and recognition of N. roraima and N. yaravi as distinct species
Neblinichthys brevibracchium and N. echinasus are new sympatric species from upland tributaries of the Mazaruni River (Essequibo River basin) of Guyana. These two new species are the first Neblinichthys reported from Guyana. Adult males of both new species have short pectoral-fin spines and several series of hypertrophied odontodes covering the entire dorsal
Neotropical Ichthyology. Publicado em: 2010